// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___THREADING_SUPPORT
#define _LIBCPP___THREADING_SUPPORT

#include <__availability>
#include <__chrono/convert_to_timespec.h>
#include <__chrono/duration.h>
#include <__config>
#include <__fwd/hash.h>
#include <ctime>
#include <errno.h>

#ifdef __MVS__
#  include <__support/ibm/nanosleep.h>
#endif

#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
#  pragma GCC system_header
#endif

#if defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
#  include <__external_threading>
#elif !defined(_LIBCPP_HAS_NO_THREADS)

#  if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
// Some platforms require <bits/atomic_wide_counter.h> in order for
// PTHREAD_COND_INITIALIZER to be expanded. Normally that would come
// in via <pthread.h>, but it's a non-modular header on those platforms,
// so libc++'s <math.h> usually absorbs atomic_wide_counter.h into the
// module with <math.h> and makes atomic_wide_counter.h invisible.
// Include <math.h> here to work around that.
#    include <math.h>

#    include <pthread.h>
#    include <sched.h>
#  elif defined(_LIBCPP_HAS_THREAD_API_C11)
#    include <threads.h>
#  endif

#  if defined(_LIBCPP_HAS_THREAD_API_WIN32)
#    define _LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_EXPORTED_FROM_ABI
#  else
#    define _LIBCPP_THREAD_ABI_VISIBILITY inline _LIBCPP_HIDE_FROM_ABI
#  endif

typedef ::timespec __libcpp_timespec_t;
#endif // !defined(_LIBCPP_HAS_NO_THREADS)

_LIBCPP_BEGIN_NAMESPACE_STD

#if !defined(_LIBCPP_HAS_NO_THREADS)

#  if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
// Mutex
typedef pthread_mutex_t __libcpp_mutex_t;
#    define _LIBCPP_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER

typedef pthread_mutex_t __libcpp_recursive_mutex_t;

// Condition Variable
typedef pthread_cond_t __libcpp_condvar_t;
#    define _LIBCPP_CONDVAR_INITIALIZER PTHREAD_COND_INITIALIZER

// Execute once
typedef pthread_once_t __libcpp_exec_once_flag;
#    define _LIBCPP_EXEC_ONCE_INITIALIZER PTHREAD_ONCE_INIT

// Thread id
#    if defined(__MVS__)
typedef unsigned long long __libcpp_thread_id;
#    else
typedef pthread_t __libcpp_thread_id;
#    endif

// Thread
#    define _LIBCPP_NULL_THREAD ((__libcpp_thread_t()))
typedef pthread_t __libcpp_thread_t;

// Thread Local Storage
typedef pthread_key_t __libcpp_tls_key;

#    define _LIBCPP_TLS_DESTRUCTOR_CC
#  elif defined(_LIBCPP_HAS_THREAD_API_C11)
// Mutex
typedef mtx_t __libcpp_mutex_t;
// mtx_t is a struct so using {} for initialization is valid.
#    define _LIBCPP_MUTEX_INITIALIZER                                                                                  \
      {}

typedef mtx_t __libcpp_recursive_mutex_t;

// Condition Variable
typedef cnd_t __libcpp_condvar_t;
// cnd_t is a struct so using {} for initialization is valid.
#    define _LIBCPP_CONDVAR_INITIALIZER                                                                                \
      {}

// Execute once
typedef ::once_flag __libcpp_exec_once_flag;
#    define _LIBCPP_EXEC_ONCE_INITIALIZER ONCE_FLAG_INIT

// Thread id
typedef thrd_t __libcpp_thread_id;

// Thread
#    define _LIBCPP_NULL_THREAD 0U

typedef thrd_t __libcpp_thread_t;

// Thread Local Storage
typedef tss_t __libcpp_tls_key;

#    define _LIBCPP_TLS_DESTRUCTOR_CC
#  elif !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
// Mutex
typedef void* __libcpp_mutex_t;
#    define _LIBCPP_MUTEX_INITIALIZER 0

#    if defined(_M_IX86) || defined(__i386__) || defined(_M_ARM) || defined(__arm__)
typedef void* __libcpp_recursive_mutex_t[6];
#    elif defined(_M_AMD64) || defined(__x86_64__) || defined(_M_ARM64) || defined(__aarch64__)
typedef void* __libcpp_recursive_mutex_t[5];
#    else
#      error Unsupported architecture
#    endif

// Condition Variable
typedef void* __libcpp_condvar_t;
#    define _LIBCPP_CONDVAR_INITIALIZER 0

// Execute Once
typedef void* __libcpp_exec_once_flag;
#    define _LIBCPP_EXEC_ONCE_INITIALIZER 0

// Thread ID
typedef long __libcpp_thread_id;

// Thread
#    define _LIBCPP_NULL_THREAD 0U

typedef void* __libcpp_thread_t;

// Thread Local Storage
typedef long __libcpp_tls_key;

#    define _LIBCPP_TLS_DESTRUCTOR_CC __stdcall
#  endif // !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)

#  if !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
// Mutex
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS int
__libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS bool
__libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS int
__libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS int __libcpp_mutex_lock(__libcpp_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS bool __libcpp_mutex_trylock(__libcpp_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS int __libcpp_mutex_unlock(__libcpp_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_mutex_destroy(__libcpp_mutex_t* __m);

// Condition variable
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_condvar_signal(__libcpp_condvar_t* __cv);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_condvar_broadcast(__libcpp_condvar_t* __cv);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS int
__libcpp_condvar_wait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS int
__libcpp_condvar_timedwait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m, __libcpp_timespec_t* __ts);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_condvar_destroy(__libcpp_condvar_t* __cv);

// Execute once
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_execute_once(__libcpp_exec_once_flag* __flag, void (*__init_routine)());

// Thread id
_LIBCPP_THREAD_ABI_VISIBILITY
bool __libcpp_thread_id_equal(__libcpp_thread_id __t1, __libcpp_thread_id __t2);

_LIBCPP_THREAD_ABI_VISIBILITY
bool __libcpp_thread_id_less(__libcpp_thread_id __t1, __libcpp_thread_id __t2);

// Thread
_LIBCPP_THREAD_ABI_VISIBILITY
bool __libcpp_thread_isnull(const __libcpp_thread_t* __t);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_thread_create(__libcpp_thread_t* __t, void* (*__func)(void*), void* __arg);

_LIBCPP_THREAD_ABI_VISIBILITY
__libcpp_thread_id __libcpp_thread_get_current_id();

_LIBCPP_THREAD_ABI_VISIBILITY
__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t* __t);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_thread_join(__libcpp_thread_t* __t);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_thread_detach(__libcpp_thread_t* __t);

_LIBCPP_THREAD_ABI_VISIBILITY
void __libcpp_thread_yield();

_LIBCPP_THREAD_ABI_VISIBILITY
void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns);

// Thread local storage
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_tls_create(__libcpp_tls_key* __key, void(_LIBCPP_TLS_DESTRUCTOR_CC* __at_exit)(void*));

_LIBCPP_THREAD_ABI_VISIBILITY
void* __libcpp_tls_get(__libcpp_tls_key __key);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_tls_set(__libcpp_tls_key __key, void* __p);

#  endif // !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)

#  if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)

int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t* __m) {
  pthread_mutexattr_t __attr;
  int __ec = pthread_mutexattr_init(&__attr);
  if (__ec)
    return __ec;
  __ec = pthread_mutexattr_settype(&__attr, PTHREAD_MUTEX_RECURSIVE);
  if (__ec) {
    pthread_mutexattr_destroy(&__attr);
    return __ec;
  }
  __ec = pthread_mutex_init(__m, &__attr);
  if (__ec) {
    pthread_mutexattr_destroy(&__attr);
    return __ec;
  }
  __ec = pthread_mutexattr_destroy(&__attr);
  if (__ec) {
    pthread_mutex_destroy(__m);
    return __ec;
  }
  return 0;
}

int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t* __m) { return pthread_mutex_lock(__m); }

bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t* __m) { return pthread_mutex_trylock(__m) == 0; }

int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t* __m) { return pthread_mutex_unlock(__m); }

int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t* __m) { return pthread_mutex_destroy(__m); }

int __libcpp_mutex_lock(__libcpp_mutex_t* __m) { return pthread_mutex_lock(__m); }

bool __libcpp_mutex_trylock(__libcpp_mutex_t* __m) { return pthread_mutex_trylock(__m) == 0; }

int __libcpp_mutex_unlock(__libcpp_mutex_t* __m) { return pthread_mutex_unlock(__m); }

int __libcpp_mutex_destroy(__libcpp_mutex_t* __m) { return pthread_mutex_destroy(__m); }

// Condition Variable
int __libcpp_condvar_signal(__libcpp_condvar_t* __cv) { return pthread_cond_signal(__cv); }

int __libcpp_condvar_broadcast(__libcpp_condvar_t* __cv) { return pthread_cond_broadcast(__cv); }

int __libcpp_condvar_wait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m) { return pthread_cond_wait(__cv, __m); }

int __libcpp_condvar_timedwait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m, __libcpp_timespec_t* __ts) {
  return pthread_cond_timedwait(__cv, __m, __ts);
}

int __libcpp_condvar_destroy(__libcpp_condvar_t* __cv) { return pthread_cond_destroy(__cv); }

// Execute once
int __libcpp_execute_once(__libcpp_exec_once_flag* __flag, void (*__init_routine)()) {
  return pthread_once(__flag, __init_routine);
}

// Thread id
// Returns non-zero if the thread ids are equal, otherwise 0
bool __libcpp_thread_id_equal(__libcpp_thread_id __t1, __libcpp_thread_id __t2) { return __t1 == __t2; }

// Returns non-zero if t1 < t2, otherwise 0
bool __libcpp_thread_id_less(__libcpp_thread_id __t1, __libcpp_thread_id __t2) { return __t1 < __t2; }

// Thread
bool __libcpp_thread_isnull(const __libcpp_thread_t* __t) { return __libcpp_thread_get_id(__t) == 0; }

int __libcpp_thread_create(__libcpp_thread_t* __t, void* (*__func)(void*), void* __arg) {
  return pthread_create(__t, nullptr, __func, __arg);
}

__libcpp_thread_id __libcpp_thread_get_current_id() {
  const __libcpp_thread_t __current_thread = pthread_self();
  return __libcpp_thread_get_id(&__current_thread);
}

__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t* __t) {
#    if defined(__MVS__)
  return __t->__;
#    else
  return *__t;
#    endif
}

int __libcpp_thread_join(__libcpp_thread_t* __t) { return pthread_join(*__t, nullptr); }

int __libcpp_thread_detach(__libcpp_thread_t* __t) { return pthread_detach(*__t); }

void __libcpp_thread_yield() { sched_yield(); }

void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns) {
  __libcpp_timespec_t __ts = std::__convert_to_timespec<__libcpp_timespec_t>(__ns);
  while (nanosleep(&__ts, &__ts) == -1 && errno == EINTR)
    ;
}

// Thread local storage
int __libcpp_tls_create(__libcpp_tls_key* __key, void (*__at_exit)(void*)) {
  return pthread_key_create(__key, __at_exit);
}

void* __libcpp_tls_get(__libcpp_tls_key __key) { return pthread_getspecific(__key); }

int __libcpp_tls_set(__libcpp_tls_key __key, void* __p) { return pthread_setspecific(__key, __p); }

#  elif defined(_LIBCPP_HAS_THREAD_API_C11)

int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t* __m) {
  return mtx_init(__m, mtx_plain | mtx_recursive) == thrd_success ? 0 : EINVAL;
}

int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t* __m) {
  return mtx_lock(__m) == thrd_success ? 0 : EINVAL;
}

bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t* __m) { return mtx_trylock(__m) == thrd_success; }

int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t* __m) {
  return mtx_unlock(__m) == thrd_success ? 0 : EINVAL;
}

int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t* __m) {
  mtx_destroy(__m);
  return 0;
}

int __libcpp_mutex_lock(__libcpp_mutex_t* __m) { return mtx_lock(__m) == thrd_success ? 0 : EINVAL; }

bool __libcpp_mutex_trylock(__libcpp_mutex_t* __m) { return mtx_trylock(__m) == thrd_success; }

int __libcpp_mutex_unlock(__libcpp_mutex_t* __m) { return mtx_unlock(__m) == thrd_success ? 0 : EINVAL; }

int __libcpp_mutex_destroy(__libcpp_mutex_t* __m) {
  mtx_destroy(__m);
  return 0;
}

// Condition Variable
int __libcpp_condvar_signal(__libcpp_condvar_t* __cv) { return cnd_signal(__cv) == thrd_success ? 0 : EINVAL; }

int __libcpp_condvar_broadcast(__libcpp_condvar_t* __cv) { return cnd_broadcast(__cv) == thrd_success ? 0 : EINVAL; }

int __libcpp_condvar_wait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m) {
  return cnd_wait(__cv, __m) == thrd_success ? 0 : EINVAL;
}

int __libcpp_condvar_timedwait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m, timespec* __ts) {
  int __ec = cnd_timedwait(__cv, __m, __ts);
  return __ec == thrd_timedout ? ETIMEDOUT : __ec;
}

int __libcpp_condvar_destroy(__libcpp_condvar_t* __cv) {
  cnd_destroy(__cv);
  return 0;
}

// Execute once
int __libcpp_execute_once(__libcpp_exec_once_flag* flag, void (*init_routine)(void)) {
  ::call_once(flag, init_routine);
  return 0;
}

// Thread id
// Returns non-zero if the thread ids are equal, otherwise 0
bool __libcpp_thread_id_equal(__libcpp_thread_id t1, __libcpp_thread_id t2) { return thrd_equal(t1, t2) != 0; }

// Returns non-zero if t1 < t2, otherwise 0
bool __libcpp_thread_id_less(__libcpp_thread_id t1, __libcpp_thread_id t2) { return t1 < t2; }

// Thread
bool __libcpp_thread_isnull(const __libcpp_thread_t* __t) { return __libcpp_thread_get_id(__t) == 0; }

int __libcpp_thread_create(__libcpp_thread_t* __t, void* (*__func)(void*), void* __arg) {
  int __ec = thrd_create(__t, reinterpret_cast<thrd_start_t>(__func), __arg);
  return __ec == thrd_nomem ? ENOMEM : __ec;
}

__libcpp_thread_id __libcpp_thread_get_current_id() { return thrd_current(); }

__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t* __t) { return *__t; }

int __libcpp_thread_join(__libcpp_thread_t* __t) { return thrd_join(*__t, nullptr) == thrd_success ? 0 : EINVAL; }

int __libcpp_thread_detach(__libcpp_thread_t* __t) { return thrd_detach(*__t) == thrd_success ? 0 : EINVAL; }

void __libcpp_thread_yield() { thrd_yield(); }

void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns) {
  __libcpp_timespec_t __ts = std::__convert_to_timespec<__libcpp_timespec_t>(__ns);
  thrd_sleep(&__ts, nullptr);
}

// Thread local storage
int __libcpp_tls_create(__libcpp_tls_key* __key, void (*__at_exit)(void*)) {
  return tss_create(__key, __at_exit) == thrd_success ? 0 : EINVAL;
}

void* __libcpp_tls_get(__libcpp_tls_key __key) { return tss_get(__key); }

int __libcpp_tls_set(__libcpp_tls_key __key, void* __p) { return tss_set(__key, __p) == thrd_success ? 0 : EINVAL; }

#  endif

#endif // !_LIBCPP_HAS_NO_THREADS

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___THREADING_SUPPORT
